Google runs the Android Market. They're the creators of Android OS and manage the store and the creation of new OS versions too.

Almost all Android tablets have the Market. There are a few no-name brand and early tablets from last year that didn't because they didn't receive Google approval. Tablets from the bigger names like Samsung, Sony, HTC, Asus, Acer, and Vizio all have the market. Budget tablets from Coby and Nextbook don't.